P0303 code, replaced coil pack and plugs - still there. - Alfa Romeo Forum
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P0303 code, replaced coil pack and plugs - still there.


I had the MIL engine warning light on for a while so bought a reader and some software. The code came back as P0303 which is a misfire on cylinder 3. So yesterday I replaced ALL spark plugs (4 x cylinder = small fortune) and the coil pack on cylinder 3.

Took the car out for a good drive after clearing the light but sure enough about 40 miles, when waiting in traffice (engine warming up) the light came on again and when hooked up it was the same damn P0303 code! Argh!

These are the readings I took with the free software that came with the reader. Anybody any ideas what to look at next? MAF? Exhaust? Thanks
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slub is offline  
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I am no expert, and don't know which engine you have, but on mine CF2 the 2 plugs in each cylinder are run from different coil packs could it be the same in yours and its the other that needs changing?
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swap coil pack to another cylinder and see if fault is on that one,if its same cylinder its fault in wiring ,if its moved to new cylinder i would assume suspect new coil pack
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code , coil , p0303 , pack , plugs , replaced

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